@article{TRSPY_1987_180_a4,
     author = {Sh. A. Alimov},
     title = {On the membership of the gradient of a~harmonic function in {S.\,M.~Nikol'skij's} class},
     journal = {Informatics and Automation},
     pages = {25--27},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a4/}
}